5G High-Band Test Chamber With Movable RF Shields for Handover Simulation

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Solution Overview

Problem

Existing 5G high band communication testing lacks effective methods for simulating mobility and handover scenarios due to the limited range of millimeter waves and the difficulty in controlling RF conditions, especially for massive MIMO and beamforming, which are crucial for ensuring seamless network transitions.

Innovation Solution

A test chamber with partially absorber-lined housing and movable RF reactive materials at openings to simulate handover conditions by controlling electromagnetic energy through independent shielding and unshielding, enabling realistic mobility performance testing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional RF attenuation boxes are used for 5G high band testing, then conducted testing can be performed, but frequencies of 26 GHz or higher are out of range and massive MIMO and beamforming are very hard to perform

Engineering Contradiction:

Improvetesting capability for 5G high bandVSAvoidtesting system complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent replaces the conventional mechanical RF attenuation box system with an electromagnetic field-based OTA testing system using a test chamber and RF reactive materials to achieve attenuation and handover simulation for 5G high band frequencies including 26 GHz and above

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the testing approach from conducted RF over cable to over-the-air RF testing, and uses RF reactive materials with variable electromagnetic properties to achieve the required attenuation effects for massive MIMO and beamforming scenarios

Inventive Principle:

Principle #35Parameter changes

2Reliability

If RF attenuation box is placed between baseband antenna RF units and antenna ports, then RF conditions can be controlled, but handover testing becomes difficult due to limited cell coverage and frequent handovers required

Engineering Contradiction:

Improveservice qualityVSAvoidhandover testing capability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent introduces dynamically movable RF reactive materials that can be positioned to simulate varying signal conditions and trigger handover events, enabling realistic mobility testing without requiring actual device movement through limited coverage areas

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent uses RF reactive materials as intermediary elements between the base station antennas and the wireless device to simulate signal attenuation and handover conditions, eliminating the need for complex physical movement scenarios

Inventive Principle:

Principle #24Intermediary (Mediator)

3Power

If millimeter waves are used for 5G high band, then download speeds of gigabit per second can be achieved, but range is limited to 200-500 meters and coverage requires high density small cell deployment

Engineering Contradiction:

Improvedownload speedVSAvoidcoverage range

Core Design Contradiction:

PowerVSLength of stationary object

Solution Approach 1:

The patent segments the testing scenario into controlled components within a test chamber, using multiple base station antennas and movable RF reactive materials to simulate the effects of limited millimeter wave range and frequent handovers without requiring actual large-scale deployment

Inventive Principle:

Principle #1Segmentation

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

Facilitates accurate simulation of handover events in a controlled lab environment, enhancing the testing of wireless devices' mobility performance and handover capabilities.

Implementation Method 1

The absorbing material absorbs RF electromagnetic energy that travels over the air (OTA) through the opening

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Implementation Method 2

a first shield configured to at least partially shield energy from entry or exit through the first opening and a second shield configured to at least partially shield energy from entry or exit through the second opening

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Data Source

PatentUS12535514B2Mobility attenuation testing equipment for 5G high band

Publication Date: 2026.01.27 TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)

AI summary

A test chamber and method for testing mobility performance of a wireless device (WD) are disclosed. The test chamber includes a housing to house the WD during the mobility performance test. The housing has a first opening configured to enable wireless communication between the WD and a first base station, and a second opening configured to enable wireless communication between the WD and a second base station. A first RF reactive material is configured to at least partially shield energy from entry or exit through the first opening and a second RF reactive material is configured to at least partially shield energy from entry or exit through the second opening. A drive system is configured to move the first RF reactive material over the first opening and move the second RF reactive material over the second opening.